Clingy-ness as mentioned before. It's not a good look ESPECIALLY when the other wants to spend every waking minute with you, we all need space and time apart also makes the yearning for the other grow. Folks need to learn how to manage that it realllllyy kills the feelings I have for someone when every waking, conscious moment they're around, even more, when they get MAD at you for going out to either spend time by yourself or have fun with other friends.
The other one is when they want you to "change" it's like a DIY make up project for them. I'm more than likely not going to change my habits and my general self just to please one person i've only known for a few weeks unless you make me fully realize what's wrong with me/whatever I'm doing OR you have made such a major impact on my life.
What I do like is badass chicks and mean when appropriate, not bitchy for uncalled reasons. Girls seem to hide it and you only see it the more you get comfy with someone or until I mention what I like after one of those offhand STEALTH questions girls do to find out what a dude likes in a girl. Girls that can stand on their own two feet are a majjjjoooorrr plus/turn on, atleast for me anyways.